Multiple choice Stomach acid is about pH 3 5 7 9 Reveal answer Fill a bubble to check yourself A Correct answer Explanation Stomach acid, which consists primarily of hydrochloric acid, is highly acidic with a typical pH ranging from 1.5 to 3.5. A pH of 3 is the only option that represents this highly acidic environment. A pH of 7 is neutral, while 9 is basic.